Hmm, good question.
I suspect that it's back to the 'cultural' thing again - Weekly vs Annual.
If we were to look at an annual view of this, lets assume that Tax Credits were based on net income, then it would seem to me to apply:
Annual Gross Earnings 10,000 PAYE -2,000 Rebate 1,000
would give us a reconciled net figure of 10,000-2,000+1,000 = 9,000.00.
On a weekly basis, or over 6 weeks if that's the appropriate period, then FOR THE SAKE OF CONVENIENCE the relevant amount is the Gross minus the PAYE. That doesn't mean that we are taking into account the actual net income - it just means that we need to do something now so we treat that figure as being the net income for this purpose.
In those circumstances then, usually, any reconciliation will be ignored, for the sake of convenience, even if, in strict terms, it can be seen to have been inaccurate retrospectively.
Perhaps this means that the treatment of income depends entirely on the period, and the perodicity, of the income and of the benefit / credit involved.
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